Update: I futzed around with the bezel spring a bit more.Today, I pulled out "the other" Vostok, the GMT (650539), on a cheap grey NATO strap. Like the other Komandirskie, this bezel was loose; however, I wasn't able to adjust it as well as the other one. It seems that I either have the spring too loose, or the bezel won't go back on the watch. I must have tried a dozen times or more! Still, it does the job (timing the halves for my son's soccer games) well enough, even if it's just a bit looser than I would like. And like the other one, it's keeping time better than expected.
I do love the utilitarian look, the seconds "wheel" and the hands-set.
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The wide-angle iPhone pic makes the case look huge on my tiny wrist, but I promise that it's better balanced!